Logic with new photos for stops appearing

When I add a new photo for a pokestop it either:

a) appears immediately
b) goes to voting with Niantic logo on it and appears in a few days
c) goes to queue and voting and takes months

Is there a logic on what happens and when?

Welcome to the forum!

Situation A is being reviewed by machine learning.
Situation B randomly happens for wayfarer contributions.
Situation C applies otherwise, and yes this can take longer (that depends on how many reviewers there are in your area and more). If you want to get a resolution faster you can apply an upgrade.

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What is random a wayfarer contribution? Only way I’ve added new photos is through Pokemon Go while I’m physically close to the pokestop.

What @iFrankmans referred to in Situation B is that the Niantic Review is random and not pre-determined for Wayfarer Contributions. He’s not saying your Contribution is random.

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Yes indeed, sorry for the confusion

Okay that explains, because those that I’ve seen to come immediately have been ie. new photos taken in a better weather than old, and those that go in voting are something that have changed in appearance completely, like a big renovation of the subject